Question 1: Define a fuse and explain its primary function in an electrical circuit.

Answer: A fuse is a safety device consisting of a thin wire that melts when current exceeds a specified value, thereby breaking the circuit and preventing damage or fire.

Question 2: Describe how a fuse protects electrical appliances from damage.

Answer: A fuse protects appliances by melting and breaking the circuit if the current becomes too high, preventing overheating and damage.

Question 1: A fuse rated at 5 A is used in a circuit. If the voltage supplied is 240 V, calculate the maximum power (in watts) that can safely pass through the fuse using the formula Power (P) = Voltage (V) x Current (I).

Answer: P = V x I = 240 V x 5 A = 1200 W

Question 2: A household fuse blows when the current exceeds 15 A. What is the maximum power in watts that the circuit can handle at 120 V?

Answer: P = V x I = 120 V x 15 A = 1800 W

Question 1: List three safety precautions to observe when replacing a fuse in a household circuit.

Answer: Turn off the power supply before replacing, use a fuse of correct rating, and avoid touching live wires.

Question 2: Describe the steps involved in safely replacing a blown fuse in a household circuit.

Answer: First, turn off the main power supply. Then, locate the fuse box and remove the blown fuse carefully. Insert a new fuse of the correct rating. Finally, turn the power back on and check the circuit for proper operation.

Question 1: A household fuse rated at 10 A blows frequently when large appliances are used. Explain what this indicates about the appliances or circuit, and suggest possible solutions.

Answer: It suggests the appliances draw current higher than 10 A, or there may be a fault causing high current. Solutions include upgrading to a higher-rated fuse, checking for faults, or using appliances within the rated current limit.

Question 1: Explain why it is important to use a fuse of the correct rating in household wiring. Include safety and equipment protection considerations in your answer.

Answer: Using a fuse of the correct rating is essential to ensure safety and protection. A fuse with a rating too low may blow unnecessarily, causing inconvenience and potential power outages. A fuse with too high a rating may not blow in time during a fault, risking overheating, damage to appliances, or fire. Proper rating ensures the fuse melts and breaks the circuit when excessive current flows, protecting both the user and the electrical equipment.

Question 1: Provide an example of how fuses are integrated into consumer electronics or industrial systems, and explain their role.

Answer: Fuses are used in appliances like microwave ovens and power supplies to prevent damage by breaking the circuit if an overload or short circuit occurs, ensuring safety and preventing fires.